Low temperature synthesis of hydroxyapatite from CaHPO4·2H2O and Ca(OH)2 based on effect of the spark plasma system (SPS)

Mamoru Omori, Takamasa Onoki, Toshiyuki Hashida, Akira Okubo, Yoshihiro Murakami

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A mixture of 6 mol of CaHPO4·2H2O and 4 mol of Ca(OH)2 was reacted to produce hydroxyapatite (HA) by spark plasma system (SPS). The reaction was carried out at 300-1200 °C under pressure of 20-670 MPa for 10 min in a vacuum. HA formation started at 300 °C at 600 MPa and was completed at 500 °C at 670 MPa, the same product being obtained at 1200 °C in air using a furnace. The temperature of the HA formation increased with decreasing pressure and was 1150 °C under 20 MPa. There was a linear relationship between the reaction temperature and pressure. The crystal size of the HA prepared at 500 °C at 670 MPa and that at 600 °C at 600 MPa by SPS were less than 1 and 2 μm, respectively.

Original languageEnglish
Pages (from-to)617-621
Number of pages5
JournalCeramics International
Issue number6
Publication statusPublished - 2006 May 29


  • Calcium phosphate
  • Hydroxyapatite
  • Hydroxyapatite synthesis
  • Spark plasma sintering (SPS)
  • Spark plasma system (SPS)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Low temperature synthesis of hydroxyapatite from CaHPO<sub>4</sub>·2H<sub>2</sub>O and Ca(OH)<sub>2</sub> based on effect of the spark plasma system (SPS)'. Together they form a unique fingerprint.

Cite this